Speed regulating system



Z50-201 AU 252 EX FIPSZIZ XR 198199139 `-E. L PETERSON? f 1.319.439 srm mummia srs'rnl l ,und Aug. 23. 1929 2 'santa-sunt 1 Goss Reieeuce mam/w Aug. 18, 1931. E. L. PETERSON 1,819,439

' SPEED naeumnu ss'rnu Fnac; Aug'. 2z. 1929 2 sheets-sheet 2 Patented Aug. is, 1931 e.;

nm L. PETERSON, 0F RIVERSIDE, CALIFORNIA PATENT OFFICE SPEED REGULATING SYSTEM'.

The present invention relates to control systems and to an apparatus for controlling the speed of a moving element.

` More particularly, the invention has to do mi `with that type of system which involves the use of light rays as an exciting medium for a light re onsive device, such as a photoelectric ce1 which is controllably associated with the element,.the speed of which is to be m regulated. g

if The invention also relates to the applica- V'tion tof this system of speed control for the purpose of. synchronization, and in this aspeet, involves the utilization of one moving lement to regulate the action of the light responsive medium in its control of either the same moving element or of a different element. f An ohiect of the invention is to provide an apparatus which involves the use of comparatively few parts and which because of its simplicity is eilicient and reliable in operation v v""In .its broader aspects,` the invention involves the use of a li ht responsive means so -constructed and refiated to the element tobe controlled that as light is imposed upon different parts thereof, its controlling action 1s varied. As a means for imposing the light upon this cell in a variable manner, theremay be used a constantly driven device adapted to direct rays of an exciting lamp upon the light responsive element or cell, this' Abeing accomplished, preferably, by reiiection and insuch a way as to supply a constant beam 'o'zf light for the photo-electric cell which may be used to control the driving element for the reector. 4 ff l I The li htresponsive medium may be a "4 single ce orY a plurality' of cells suitably connected withamplying media which are in circuitwith theelement, the speed of which is'to berregulated.

f The foregoing'and other objecs and features ofthe-'invention will rbe clearer as the descriptionprceeds ,in connectinn with certain referred embodiments. shown the accompanying drav s,wherein:.

-Figure l; is an elevational viewvof'a system .5 embodying my invention. i

w Lpylication led August 23 Figure 2 is an elevational view of a suitable photo-electric cell.

Figure 3 is a horizontal sectional view of the cell shown in Figure 2.

Figure 4 is a somewhat diagrammatic view 55 of a modified form.

Figure 5 is a vertical sectional view taken through the'bearn focusingv lense shown in Fi re4. y,

igure 6 is a diagrammatic view of still U0 another modification, and l Figure 7 is adetail view. y v Referring to the drawings for a more detailed description, I0 yindlcates an element, the speed of which isto be regulated, the same W in the present instance being a motor. The motor may be connected by a'shaft 11. with a generator 12 adapted to supply current to an desired (point.

e spee .of the motor 10 may be regu- 'n lated trom a light responsive means or cell, such as a photo-electric cell 13, which should be of a character adapted to vary the speed of the motor as light 1s imposed upon difierent parts of "the cell. For this purpose, the cell may have' a plurality of vcathodes I5, I6, I'Z, insulated firom each other yas at T9 and each having transparent glass backing 18, and a light exciting coating 19', such as potassium, which when exposed to iight, produces a discharge of electrons. A common anode I4 may be provided wtha terminal 14 and each ofthe cathodes is connected by terminals 15', 16'. 17 to se arate amplifying devices or units 15, 16,1 f.

The amplifying unitsare each connected i'n a suitable manner with .the motor and regu- `late the supply Iof current :tor the motor which passes through Vthese amplifying units; the current supply may be a attery or any other source. Sincethe precise character of the various amplifying units forms no part of the present invention, itis thou htunnecssary to describe'the same in detail', and for example, Il refer to the patent .to Potter, 1,692,904, November 27, AVA1928, as 'showing a suitable' circuit 'for amplifying the4 response of .the photofelectriccel T3. 'It willbe understood, of course,y that each of thev dierent ciated therewith a motor currentsource land is adapted to produce a different speed in the fmotor 10. These 'units may be multiplied as desired.

For the purpose of imposing'the light upon `the desired cathode, the motor may drive through gearing 20 a governor 2l, which is ladapted as its speed varies, to movealong the vertical shaft 22 a substantially "conica'lly 10 shaped refiector 24 adapted vto reflect rays from an exciter lamp 25 vtoward the cell 13. Rays from the light 25 pass through a lens 26 so as to be reduced to a pencil-like beam, which may be moved back and forth between the cathodes of the photo-electric cell to regulate the speed of the motor 10.

It will be understood, of course, that the supply which passes through the amplifying units, each 4 of which may have separate source, such as batteries, as illustrated in the atent mentioned above, or a common source rom any suitable supply line. Of course, each unit produces a different amplification of current, and, as will be observed, each' has a cathode in cell 23 of different area so as to produce this result.

`Referring to Figure 4, the refiector '24 movable longitudinallyv of the governor shaft so is driven from a motor 27 of the direct current type having its field 28 connected across adirect current source represented as a battery 29. The armature clrcuit of the motor ,is connected across a variable portion of a `resistance 30 connected across the battery 29. Armature lead 31 is manually adjustable along the upper portion of resistance 3()` and armature lead 32 is adjustable along the lower portion of the resistance 30 by means o of an automatic rheostat which is made responsive to very slight variations in the relative rates of rotation of the governor 2l' and of the reflector 24', so as to maintain the A'motor at the desired speed. In this form. the 15 cone-shaped refiector has dark or non-reflecting strips 24a formed as by printing thereon, lalternating with reflecting strips'24b so as to make the light refiection intermittent and work thei relay more than once, if necessary. g

he rheostat comprises stationary contacts 3 connected by taps to different points on he lower section of the resistance 30, a rotatable ratchet wheel 34 to which is secured the rheostat arm 35, ratchets 36 and 37 for rotatg. ing the wheel 34 in opposite directions'of rotation, and relays'38 and 39 for respectively operating the ratchets 36 and 37. i

4,Relay `38 is connected to a battery 40 .through an amplifying tube 41, and theoper- ,v ation of the tube is Ycontrolled by a photoelectric cell 42 located so as to 'have light .rays imposed thereon by the refiector 24 as the latter ,moves upwardly. The tube is of the vacuum type, preferably a pliotron tube,

fi having la lamentheated bypa local battery brote anatema mm/iff,

flectedlby the reflector 24', the potential of 75 ,the grid 45wvill be changed and allow current to flow vthrough the plate circuit, including the relay -38- from the battery 40. Pliotron Igrids have a strong negative bias when no light enters the photo-electric cells so that no current flows in the plate circuit except ,when the rheostat is beingoperated. motor receives its power 'from any suitable Relay 39 is controlled in a similar manner by a tube 50 and a photo-electric cell 5l when light rays are imposed upon this cell by l g5 .the refiector. Y, y .i From the 'foregoing description, the man ner in which the light rays from the source 48 are allowed to control the motor will be clear. Of course, the photo-electric cells` 42, 5l are-enclosed so that only light from the exciting source 48 can reach them, and the same-must pass through the lens 52 so as to be focused properly. As the speed of the motor varies, it will move the beam reiected by the rotating reflector 24 back and ,forth between the photo-electric cell 42 and the cell 5l, thereby regulating the rheostat and controlling the motor speed.

A further detailed description of this form is thought unnecessary, since the control mechanism is similar to that disclosed in the patent to Hoxie, 1.618,757, granted February22. 1927. This form of device utilizes, ,as will be understood, my method of controlling o r regulating speed by means of a constantly driven element adapted to reflect light, and as it moves bodily to change the path of'reflection so that the light is imposed Aupon `differently responsiveV photo-electric means adapted to change the speed of a mov- ,ing element which in the formdescribed, is the motor 27. i Y

Referring to lFigures 6 and 7, the method ,is shown as used for the purpose of synchro- 11a 'nizing the speed of a motor or other element with av'separately ldriven moving element. In this lform of the device, 'one element may be, forinstance, a Elm strip 60 travelling from -a supply reel 61-to a take-up reel 62, the 12o latter beingdrivenfbyany suitable means y(not shown). Arranged,adjacent the path of the film is an exciter lamp 63 adapted to project raysuthrough an vaperture 64 in a gate, theapcrture being disposed so that it lfwill coincide with openings 65 in the film strip as vthe latter pass the gate. Light rays passing through thefilm opening 65 are reflected by the faces of a mirror element 66 driven from a motor 67, the speed of which `l to be controlled. The motor 67 is .shown connected in circuit with photo-electric cells 42', 51'; the remainder of the circuit corresponds with that shown in Figure 4, and ,in the patent to Hoxie mentioned above. The speed `of the motor will ordinarily he Vsuch that as the film aperture 65 coincides "with the gate aperture 64, the light will be reflected, for example, between the photoelectric cells 42,51', thus maintaining the vrheostat in set position. However, should vthere be any variation in the speed of the motor which may be employed to drive any .device which is to be synchronized with the film 60, the light will be reflected -at-such an angle as to be imposed upon either the photolelectric cell 42 or the photo-electric cell 5l', vdepending upon whether the speed of the Vmotor is relatively slower or relatively faster than the speed of the film 60. It is thought unnecessary to describe in detail the operation of the mechanism illustrated in Figure 6, since this is set forth in detail in the patent above mentioned and in connection with the description of the construction shown in Figure 4, which is identical, the parts of the two mechanisms bearing 4corresponding numerals, except for the photoelectric cells.

Obviously, numerous modifications may be made in the structure and system illus- -trated and described without departing from the invention, the characteristic features of which are more definitely set forth in thc following claims.

I claim l. In a speed regulating system, a source of light` a driven element adapted to reflect the light and variable in position to change the path of travel of the reflected light as the speed of the element varies, a motor, means for varying the position of said driven element and light responsive means for controlling the speed of said motor in accordance with changes in `the path of said reflected light.

Q. In a speed regulating system, a source of light, a driven element adapted to reflect the light and variable in position to change the .path of travel of the reflected light as the speed of the element varies. a motor for driving said element, vmeans for varyingr the position of said driven velement and light responsive means for controlling the speed of said motor in accordance with changes in the pathof said reflected light.'

3. In a speed regulating system, a source of light, a driven element adapted to reilect'the light and bodily movable in accordance with speed variations thereof to change the path of travel of the reflected light as the speed of the element -varies, a .mot-or, means for bodily moving said element and light responsive means for controlling the speed of-said motorl in accordance `with changes in the path of said reflected light.

4. In a speed regulating system, a source Aof light, a driven element :adapted to reflect the light and bodily movable in accordance with speed variations thereof to change the path of travel of the reflected light as the speed of the element varies, ia .mot-or, means for bodily moving said element and light responsive means for controlling the speed fof said motor in accordance with changes in the path of said reflected light.

A5. In a speed regulating system, a source vof light, a driven element adapted to direct the light selectively along a plurality of different paths and to transpose the .light from =one pathto another as the speed of the element varies, a motor, means for variably controlling said element to Achange the path lof the reflected light and light responsive means for controlling the speed of said motor in accordance with the transportation of the light from one path to another.

6. In a speed regulating system, a source of light, a driven element adapted to direct the light selectively along a plurality of different substantially parallel paths and bodily movable as it is driven to transpose the light from one path to another as its speed of movement varies, a motor, means for bodily moving said element and light responsive means for controlling the speed of said motor in accordance with the transposition of the light from one Vpath to another.

'7. In a speed regulating system, a source of light, a driven element adapted to direct the light selectively along a plurality of different paths and to transpose the light from one path to another as the speed of the element varies, a motor for driving said element, meansvfor variahly controlling said element to change the path of the reflected light and flight responsive means :for controlling the speed of said-motor in accordance with the transposition of the light from one pathto another. f

8. In .a speed regulating system, a source of light, a driven element adapted to direct thelightselectively along a plurality of different substantially parallel paths and to transpose 'the light from one .path to another as the speed of the element varies, a motor for driving said element,means for variably cont-rolling said element to change the path of the 'reflected lightand light responsive means for controllingl the speed of said motor in 'accordance with thetransposition of the light .fromme path to another. ,K

. 9. In a speed regulating'system, a source of light, a driven element adapted to direct the light selectively along a plurality of different paths and bodily movable as it is driven to transpose `the light from onepath to another as the speed of the element varies,

a motor, means for bodily moving said element and light responsive means for controlling the speed of said motor inaccord-4 Aance with vthe transposition of the light'from ioflight, a rotating reflector adapted to reflect constantly the light and movable along its i 5 one path to another. .i

10. .In a speed regulating system, a source -of light, 'a driven element adapted to direct -the light selectively along a plurality of different substantially parallel paths 'and bodily g l .movable as it is driven to transpose the light :from one path to another as the speed of the element varies, a motor, means for bodily =moving said element and light responsive means for controlling the speed of said motor l 'in accordance with the transposition of the light from one pathto another.

11. In a speed regulating system, a source of light, a driven element adapted to direct the light selectively along a plurality of difz ferent substantially parallelpaths and bodily finovable as it is driven to transpose the light from one path to another as the speed of the element varies, a motor'for driving said element, means for bodily moving said element 25 and light responsive means for controlling the speed of said motor in accordance with the transposition of the light from one path 'to another.

1Q. In a system for regulating speed, a mo- 30 tor, a light responsive cell, means connecting said cell with said motor whereby to control its speed in accordance with the varying response of the cell to light imposed thereon, said light responsive cell being differently re- '85 sponsive at diferentparts thereof whereby to cha-nge speed, a source of light, a driven element, and means for imposing said source of light upon different parts of said light responsive cell in accordance with changes in i 4o the speed of the driven element.

13. In a system for regulating speed, a motor, a light responsive cell, means connect-ing said cell with said motor whereby to control its speed in accordance with the varying re- 45 spouse of the cell to light imposed thereon,

said light responsive cell being differently responsive at differentparts thereof whereby to change speed, a source of light, a driven element, and means for imposing said source "50 of light upon different parts of said light responsive cell in accordance with changes in the speed of the driven element, said element being driven from said motor.

. 14. A speed regulating system as defined in 5 claim 12, said driven element having a reflecting capacity and serving to reflect the light along different paths to said light responsive cell as the speed of the driven element varies.

15. In a speed regulating system, a source 69 of light, -a rotating reflector adapted to reflect thelight and movable from joneposition to another, as its speed of rotation varies to change the path of travel of the reflected light, a motor, means for changing the posif means `for controlling the speed of said motor in accordance with changes in the path of said-reflected light.

I6. In a speed regulating system, a source -airis of rotation as the speed of rotation varies `to change the path of travel of the reflected light, a motor, means for moving said reflector along its axis of rotation and light responsive means for controlling the speed of sai motor in accordance with changes in the path of said reflected light. l-

17. In a speed regulating system, a source of light, a rotating reflector adapted to re- -fiect the light an bodily movable as the speed of rotation varies to change the path of travel of the reflected light, a motor. means 'for bodily moving said reflector and light resoonsive means for controlling the speed ofsaid motor in accordance with changes in the path of said reflected light.

18. In a speed regulating system, a source 4of light, a rotating reflector adapted to reflect 'con'rtantlv the light and bodily movable as the speed of rotation varies to change the 'path of travel of the reflected light, a motor, means for bodily moving Said reflector and light responsive ineans for controlling the speed of said motor in accordance with changes in the pathv of said reflected light. j 19. In a speed regulating system, a source of light, a driven element adapted to direct the light selectively along a plurality of different paths and having a secondary movement adapted to transpose the light from one path to another as the speed of rotation varies, a motor, means for imparting the said secondary movement to the driven element and light responsive means for controlling the speed-of said motor in accordance with the transposition of light from one path to another` said element being adapted to direct the light constantly and along paths which are substantially parallel.

20. In a speed regulating system, a source of light. a driven element adapted to reflect the light selectively along a plurality of different paths and having a secondary movement whereby to transpose the light from one pathto vanother as the speed of rotation varies, a motor for driving said element, means for' imparting said Secondary movement to the driven element and light responsive means for controlling the speed of said motor in accordance with the transposition of the light from one path to another, said element being adapted to reflect the light constantly and along paths which are substantially parallel.

In testimony whereof I have hereunto set iiiy hand. 4

ELWIN'L PETERSON.

4tion of said reflector and light responsive lBO 

